> ... is one of my favorite side effects of it being open sourced.
Agree!
I would never have the time or expertise to work all this out just using WinDBG or similar. Having the source, including decent comments and things like the BOTR [0] is amazing for exploring the internals!
It's great for sure but there were deep dive books much more comprehensive than this on the clr and jit that I read a decade ago. Microsoft press has always had great technical resources. I actually really miss the days of technical books. Blog posts serve a purpose but they definitely never adequately replaced books.
I also enjoy the internal blog posts from teams such as Edge at MS.
It is a great time for software to be sure.